↑ 2.02.1Ellenblum, Roni. (2006). Crusader castles and modern histories, p. 122; excerpt, "...it is the modern traveller and scholar who attributes to the limes all the meanings of a boundary line. The Roman sources themselves are mute concerning the existence of border lines, and it was modern scholarship which assumed that the Romans were capable of realizing in practice what they could not define verbally."